July 12, 2011 for about 140,000,000 if I remember correctly. That was the last discounted to the public spo. They did an ATM from "time to time", meaning whenever management felt like it at the market back in Mar of 2012 for about another 140,000,000 or so.
They do accretive offerings on spo's so the PPS has to get a sufficient amount above BV to offer. NLY has been floundering so badly it might be like "never" that the PPS will get to the point of supporting an accretive spo.